[Nexus 4 Q&A, Help & Troubleshooting] Micoolef:
The following was taken from: tasker.wikidot.com/auto-replysms-driving

First we need to setup a profile that will automatically respond to any SMS that we receive. We will later disable it until it is called by our other profile for when the Car Cradle is active.

Profile (SMS Responder)

Click New then Event

Next Click Phone then Received SMS

Make sure to leave the Sender & Message fields blank and click Done

Now we will customize the SMS Responder profile to send SMS responses to everyone except the last sender. This will ensure that a person who texts you twice in a row won't be bombarded with auto-reply texts.

Click the + then Tasker

Select the option If from the menu

Input %LASTSMS in the first box

Ensure the !~ (doesn't match) is selected as the operator

In the last box input %SMSRF

Click Done.

Click the + then Phone

Select the option Send SMS from the menu

Input %SMSRF as the number

For the message input whatever you want to be set back to the sender.

An Example:

Auto-Response: Hi, %SMSRN, I'm currently driving. I'll respond when I can.

If you want to see if the auto-response actually sent make sure to check the box "Store in Messaging App"

Click Done

Click the + then Variable

Select the option Variable Set from the menu

Input %LASTSMS in field Name

Input %SMSRF as the To field

Click Done.

Click the + then Tasker

Select the option End If from the menu

Click Done.

We are almost done with this profile.

Make sure you disable the profile by returning to the main menu

and clicking and holding on the profile name and select Disable

This ensures that tasker won't automatically send an auto-response to everyone that texts you.

Profile (Car Mode)

Click New then Application

Select Car Cradle

Click Done.

Click the + then Tasker

Click Profile Status

Input SMS Responder and select set to On

Click Done.

Click the Enter Task then Add Exit Task

Click the + then Variable

Select the option Variable Clear

Enter %LASTSMS in the Name field.

Click Done.

Click + then Tasker

Select the option Profile Status

Input SMS Responder and select Set to Off

Click Done.

The final two steps clear the %LASTSMS variable and turn off the profile when you take your phone out of the car dock. You want to clear the variable so that the next time your phone is placed in the car dock, everyone will receive the auto response at least once.

If the variable isn't cleared, if Person A texts you the next time the phone is in the dock, and Person A also happens to be the last person who sent you a text before removing the phone from the dock last time, they will not get an auto-response.

You can add other functionality to this profile like bluetooth toggling and volume controls, but this is the bare minimum to get auto-response to a SMS working.

This should help you out with the profile. Instead of having the state be "Car Cradle", yours would be Bluetooth.

I am in a similar situation. I would like to avoid using Tasker profiles all together and just have the NFC Tag be my trigger (context). I will continue to play around, but my end goal is to enter my car, swipe the tag, and have all incoming texts from that point have an autorespond message. Then, upon exiting the car, I will reswipe the tag and the autorespond will be deactivated. Any advice or suggestions would be much appreciated!